Thermometer tube



u y F. R. SUNDERLIN THERMOMETER TUBE Original Filed Aug. 9, 1923 TD PEDAL I I gn-vewio-z Han/r12. Sunder] 1' n Painte July 12, 1927. i

UNITED STATES PATENT OFFICE.

FRANK RANSOME SUNDERLIN, 0F TERRE HAUTE, INDIANA, ASSIGNOR TO CENTRAIS ADVERTISING SPECIALTY COMPANY, OF TERRE HAU'IE, INDIANA, A CORPORATION OF INDIANA.

Application filed August 9, 1923, Serial No. 656,600. Renewed Deember 9, 1926.

those now in use and which shall be so shaped that they may be more closely packed in shipping.

A further object of the invention is to' provide thermometer tubes which shall be less easily broken than those now in use, particularly in shipping them. I

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, I

Figure 1 is a perspective of the machine by which the method of my invention is carried out,

Figure 2, a front elevation of a thermometer tube made according to my invention and e Figure 3, a side elevation thereof. In the drawings reference character 10 indicates the lower member of a clamp or press and 11 the upper member. these clamps being hinged together at 12 andthe lower member being rigidly supported in any desirable manner and preferably in horizontal position- A spring 13 is interposed between the clamps and holds them normally apart as indicated in the drawing. A rod 14 is attached to the upper clamp member and at its lower end is secured to a foot pedal in any desirable manner thus providing means whereby the clamps may be drawn together by foot power and normally spread apart by the spring 13.

At the upper side of the upper clamp there is a caliper 15 having open jaws. This caliper provides means for calibrating the bulb of the thermometer as the tube is blown. the position of the tube being preferably as indicated in dotted lines at 16.

In the'practice of my invention a tube is blown in the position indicated in dotted lines, the caliper serving to determine the correct diameter of the bulb. After the correct diameter has been reached and 'while the glass; is still hot so as to flatten the bulb.

The thermometer made according to my invention is shown in Figures 2 and 3. This thermometer has the usual stem 17 with a longitudinal cavity for the reception of a body of mercury or other heat responsive liquid indicated at 18. At the lower end is a bulb 19 which as clearly shown in Figure 3 is flattened and ordinarily will also be indented at 20 in the process of flattening although the indenting is not necessary. The hollow interior of the bulb as usual is connected to the longitudinal cavity 1n the tube.

The means constituting my invention may -be modified in various ways which will be obvious to those skilled in the art and therefore I do not limit myself to what is shown in the drawings and described in the spcci fication, but only as indicated in the appended claim.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent; is:

An apparatus for manufacturing thermometer tubes comprising a clamp having a relatively broad flat fixed jaw. a relatively broad fiat movable jaw hingedly supported by said fixed jaw, spring means for bolding the movable'jaw in normally spaced relation from the fixed jaw, and manually operable means for moving the movable jaw toward the fixed jaw, substantially as set forth. 7 r V In witness whereof. I have hereunto set my hand at Terre- Haute. Indiana. this 6th day of August, A. D. nineteen hundred and twenty-three.

FRANK RANSOME SUNDERLIN. 

